EP 1915249 A1 20080430 - METHOD FOR PRODUCING ORIENTED SLIT FILM TAPES
Title (en)
METHOD FOR PRODUCING ORIENTED SLIT FILM TAPES
Title (de)
VERFAHREN ZUR HERSTELLUNG VON AUSGERICHTETEN SCHLITZFILMBÄNDERN
Title (fr)
PROCÉDÉ PERMETTANT DE PRODUIRE DES RUBANS DE FILM FENDUS ORIENTÉS
Publication
Application
Priority
- IN 2006000453 W 20061116
- IN 3097DE2005 A 20051121
Abstract (en)
[origin: US8003031B2] The invention relates to a method for producing oriented slit film tapes, comprising the following steps: extruding melt polymer through a die (2); simultaneous quenching and melt-drawing of the molten polymer in the cooling device to form a film sheet (3); slitting the initial film sheet into a plurality of relatively narrow slit film tapes (4); stretching (8) at elevated temperature, by passing the slit film tapes through a heating medium (7) at a temperature just below the softening temperature of the slit film tapes; y annealing and cooling the oriented slit film tapes (10, 11); winding the slit film tapes (13); characterized in that before the stretching step, it has a stage of pre-stretching (108) made by passing the slit film tapes through one set of heated holding rollers (107) turning at a given speed and one set of cooled pre-stretch rollers (109) turning faster than the heated holding rollers, wherein at least one of the rollers of the set of holding rollers is heated and at least one of the rollers of the set of pre-stretch rollers is cooled. The invention also relates to an apparatus for performing this method and to the products obtained by said method.
IPC 8 full level
B29C 55/06 (2006.01); B29C 48/28 (2019.01); B29C 48/355 (2019.01)
CPC (source: EP US)
B29C 48/0022 (2019.02 - EP US); B29C 48/08 (2019.02 - EP US); B29C 48/28 (2019.02 - EP US); B29C 48/355 (2019.02 - EP US); B29C 48/91 (2019.02 - EP US); B29C 48/914 (2019.02 - EP US); B29C 48/919 (2019.02 - EP US); B29C 55/065 (2013.01 - EP US); B29C 48/001 (2019.02 - EP US); B29C 48/0018 (2019.02 - EP US); B29C 48/911 (2019.02 - EP US); B29C 2793/0036 (2013.01 - EP US); B29K 2023/0625 (2013.01 - EP US); B29K 2023/065 (2013.01 - EP US); B29K 2023/12 (2013.01 - EP US); B29K 2105/0032 (2013.01 - EP US); B29K 2105/005 (2013.01 - EP US); B29K 2105/256 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2007057923 A1 20070524; AT E413267 T1 20081115; BR PI0618877 A2 20110913; BR PI0618877 B1 20180206; CN 101365575 A 20090211; CN 101365575 B 20120321; DE 602006003567 D1 20081218; EA 013853 B1 20100830; EA 200801380 A1 20090428; EG 25090 A 20110810; EP 1915249 A1 20080430; EP 1915249 B1 20081105; ES 2317589 T3 20090416; IN 266816 B 20150603; MX 2008005321 A 20080911; PL 1915249 T3 20090430; PT 1915249 E 20081125; US 2008258333 A1 20081023; US 8003031 B2 20110823
DOCDB simple family (application)
IN 2006000453 W 20061116; AT 06821701 T 20061116; BR PI0618877 A 20061116; CN 200680041528 A 20061116; DE 602006003567 T 20061116; EA 200801380 A 20061116; EG 2008050818 A 20080519; EP 06821701 A 20061116; ES 06821701 T 20061116; IN 3097DE2005 A 20051121; MX 2008005321 A 20061116; PL 06821701 T 20061116; PT 06821701 T 20061116; US 9429006 A 20061116